Study on the Characteristics of a Vibration-Excited Magnetoelectric Generator

Abstract

To collect environmental vibration energy for powering low-power electronic devices, a magnetoelectric vibration power generation device based on E-shaped silicon steel sheets is designed. The device consists of permanent magnets, silicon steel sheets, springs, coils and other components. Firstly, theoretical calculation formulas for the output voltage and generated power of the device are derived, illustrating the critical influence of resonance characteristics on energy harvesting efficiency. Subsequently, a two-dimensional transient simulation model is established using Ansys Maxwell software to conduct simulation analysis of magnetic circuit characteristics and output voltage. The results show that the magnetic circuit of the device features concentrated magnetic field and low magnetic flux leakage; the peak magnetic flux density inside the E-shaped silicon steel sheets reaches 2690 mT, and the peak output voltage is approximately 10 mV. Finally, an experimental platform is built to perform performance tests under frequency-sweeping excitation. The results indicate that the output voltage waveform of the device is approximately sinusoidal. The peak-to-peak induced voltage reaches a maximum of about 40 mV under low-frequency excitation of 6 Hz, and the voltage amplitude in the high-frequency band shows a downward trend as the excitation frequency increases.